>>639
C_:(x-1/2)^2+(y-1/2)^2=1
C1:(x-a)^2+(y-(1+√2)a)^2=a^2
C2:(x-(1+√2)a)^2+(y-a)^2=a^2
C3:(x-((1+1/√2)a-2a/√2))^2+(y-((1+1/√2)a-2a/√2))^2=4a^2